Girar foto 90 graus em PHP

$image_file = 'foto.jpg';
$targetfile = 'nova_foto.jpg';

// algulo em que a foto sera girada
$degrees = 90;

$source = imagecreatefromjpeg($image_file);

$rotate = imagerotate($source, $degrees, 0);

imagejpeg($rotate, $targetfile);
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